It happened because Eisner's baby Dinosaur was released in the theatres, in what, 2000?
So they changed the name (since you can't have an attraction without a character during the final days of the Empire) and put Aladar in front. And on the ride.
To be honest I haven't been on it since it was CTX. Indy spoils me. Isn't it supposed to be the exact same track layout?